W Magazine threw a party to celebrate its Best Performances Issue at the Chateau Marmont in LA last night. Brad Pitt and Charlize Theron are featured on two separate covers for the publication, though there are plenty more award season contenders inside the pages. In attendance yesterday were Emma Stone, in Lanvin, Elizabeth Olsen, Rachel Zoe, and more stars who have been making the rounds all week.

One new face on the carpet was Jessica Biel, who had no ring on her finger despite news that she and Justin Timberlake got engaged over the holidays. Jessica didn't stop to chat on her way into the bash, though we did share a few words with The Help's Octavia Spencer and Viola Davis. Octavia talked about almost missing the presentation of the best ensemble cast award at the Critics' Choice Awards, while Viola gave us some insight into how she prepares her speeches. Miranda Kerr also posed for cameras in a bright white dress after stepping out to celebrate her new role with Qantas and her husband Orlando Bloom's birthday this week.